US4767172A - Collector for an LED array - Google Patents
Collector for an LED array Download PDFInfo
- Publication number
- US4767172A US4767172A US07/709,973 US70997385A US4767172A US 4767172 A US4767172 A US 4767172A US 70997385 A US70997385 A US 70997385A US 4767172 A US4767172 A US 4767172A
- Authority
- US
- United States
- Prior art keywords
- light
- led
- collector
- substrate
- wave guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0091—Reflectors for light sources using total internal reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
- G02B6/425—Optical features
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/045—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas
- G03G15/047—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas for discharging non-image areas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/04—Arrangements for exposing and producing an image
- G03G2215/0429—Changing or enhancing the image
- G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
- G03G2215/0448—Charge-erasing means for the non-image area
- G03G2215/0451—Light-emitting array or panel
Definitions
- the present invention relates to a light collector for an LED array, in particular a light collector for an array used in an electrophotographic machine for patch generation on a photoreceptor surface and for pitch and edge erasure on the surface.
- LEDs Light emitting diodes
- the broad light patterns of LEDs often impede the efficient of the LEDs with light pipes, optical wave guides or other optical transmission media.
- a spherical lens structure is used as an optical coupler for coupling a relatively wide emission light source to an optical transmission line.
- the wide emission light source is mounted adjacent the center of one end of a cylinder.
- the spherical lens structure is mounted on the opposite end of the cylinder at a predetermined distance from the light source and in an orientation to maximize the amount of light entering the optical transmission line.
- a difficulty with prior art systems using LED arrays is that there is generally a loss of edge light that is not captured by the light pipes with the resultant inefficient light transmission. Another difficulty arises from imperfect or uncollimated light entering the wave guide resulting in light exiting the wave guide in an uncontrolled fashion and discharging portions of the image. In addition, it is relatively complex and expensive to mount and package a large array of discrete LEDs. It would be desirable, therefore, to provide an efficient and simple means to collect and propagate light in a well controlled manner from an array of LEDs to a photoconductive surface.
- an object of the present invention to provide a new and improved light collector for an LED array. It is another object of the present invention to provide a light collector for an LED array for use in discharging selected portions of a photoconductive surface.
- the present invention is a light collector for an LED array for efficiently collecting and collimating light emitting from the LEDs and projecting the light into an optical wave guide which directs that light onto a photoreceptor surface.
- Each LED is centered in a hemispherical cavity in the collector array in order that radiation from the LED enters the collector essentially unrefracted.
- the collector array provides a convex lens portion and a parabolic reflecting surface portion. Light that exits from the LED that is substantially perpendicular to the substrate supporting the LED is applied to the convex lens and is collimated. Light exiting substantially parallel to the substrate strikes a parabolic reflecting surface at greater than the critical angle and is also collimated.
- the two concentric collimated beams are combined and applied to the photoreceptor surface via a light pipe or optical wave guide secured to the collector.
- FIG. 1 is a typical prior art configuration of the means to capture the light rays emitting from an LED
- FIG. 2 is a profile of a light collector in accordance with the present invention.
- FIG. 3 is an isometric drawing illustrating the LED array and segmented light pipes
- FIG. 4 is a sectional view of the relationship of an LED, the light collector, and the light pipe in accordance with the present invention
- FIGS. 5, 6 and 7 are a top view, end view cross section and side view cross section of the LED array and light collector in accordance with the present invention.
- FIG. 8 is an illustration of the LED array and light collector in relation to a photoreceptor surface.
- a light emitting diode 20 is positioned at the focal point of a suitably coated reflector 22.
- the light rays emitted from the sides of the LED are relected from the reflector 22 into a generally collimated light beam.
- the light rays emitted from the front of the LED do not strike the reflector and are therefore scattered and lost.
- the lens 24 may collimate the scattered light rays, it tends to disperse those light rays already collimated by the reflector 22.
- an integrally molded light collector for collecting and collimating the light rays projected from an LED as shown in FIG. 2.
- an LED 28 is suitably mounted on a substrate 30.
- the integral collector 26 is preferably any appropriate transparent plastic material such as styrene, acrylic or polycarbonate.
- the collector is comprised of a convex center lens portion 32 with a concentric surrounding leg portion 34 appending therefrom. An edge portion of the leg 34 is rigidly secured to the substrate 30 concentric with the LED 28.
- substrate 30 is a porcelain coated metal or ceramic material.
- a semicircular air pocket 40 separates the LED 28 from the collector 26.
- the cavity around the LED provides mechanical protection and insulation from dirt and other foreign particles that might diminish light output. It should be noted the cavity or air pocket 40 could be filled with any suitable optical transparent filler in order to increase the output of the LED through index of refraction matching. Another air pocket 42 is formed between the leg 34 and the lens 32.
- light rays projected from the sides of the LED 28 traverse the air pocket 40, enter the end portion of the leg 34 and are reflected from the parabolic outside surface 34a of the leg 34 and form generally parallel light paths or collimated beams of light through the leg 34.
- Light rays projected from the top of the LED 28 traverse the air pocket 40 and enter portion 32.
- the convex surface lens 32 as illustrated, refracts the light beams into a collimated beam into and through the air pocket 42.
- an array of LEDs is used in a strip to selectively dissipate the charge on a photoreceptor.
- a substrate 30 supporting a plurality of LEDs 44 aligned with an optical wave guide 46 comprising a plurality of light pipes 48.
- the optical wave guide 46 is rigidly secured to the substrate 30, in order that one end of each of the segmented light pipes 48 is securely fastened in alignment with one or more of the LEDs 44.
- Light pipes of various widths could be provided in alignment with one or more LEDs to perform designated functions. For example, light pipes could be used for edge fadeout, pitch erase, and patch generators in an electrophotographic machine.
- the collector 26 is an integral unit comprised of several subassemblies having a lens portion 32 and a leg portion 34, although only one assembly is illustrated in FIG. 4.
- the optical wave guide 46 includes a connector portion 52, a reflector surface 54 and a light pipe portion 48 terminating adjacent to a photoreceptor surface.
- the light rays projecting from the LED 28 are reflected through the leg portion 34 or refracted through the lens surface 32 into well collimated, concentric beams of light that are reflected from the surface 54 into the light pipe 48.
- the light rays projected from the LED either from the side or from the top of the LED are reflected by either the legs or refracted by the lens 32 into two collimated beams. Since the two beams are well collimated, reflection from surface 54 can be by total internal reflection, thus avoiding the need to coat surface 54 with a reflective material.
- FIGS. 5, 6 and 7 show in more detail a top view, an end view cross section and a side view cross section of an LED collector array.
- FIG. 8 a photoconductor 60 in an electrophotographic process.
- the photoconductor 60 is illustrated as rotating in a clockwise direction to receive first a uniform charge under a charging device 62.
- the photoreceptor Upon receiving an image at station 64, the photoreceptor continues to rotate to the LED array and segmented light pipes illustrated at 66. By selective activation of LEDs, the light pipes can be used to discharge edge portions or pitch portions on the photoreceptor surface or to provide a test patch for system correction.
- the photoreceptor advances to the development station illustrated at 68 at which toner is placed on the image and on the test patch if present, and then to the transfer station 70 at which the image is transferred to a copy sheet. Not shown are the usual steps of fusing of the image to the copy sheet and the placement of the copy sheet in an output tray.
Abstract
Description
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US07/709,973 US4767172A (en) | 1983-01-28 | 1985-03-11 | Collector for an LED array |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US46177983A | 1983-01-28 | 1983-01-28 | |
US07/709,973 US4767172A (en) | 1983-01-28 | 1985-03-11 | Collector for an LED array |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US46177983A Continuation | 1983-01-28 | 1983-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4767172A true US4767172A (en) | 1988-08-30 |
Family
ID=27040122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/709,973 Expired - Lifetime US4767172A (en) | 1983-01-28 | 1985-03-11 | Collector for an LED array |
Country Status (1)
Country | Link |
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US (1) | US4767172A (en) |
Cited By (183)
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US4921316A (en) * | 1989-03-06 | 1990-05-01 | Polaroid Corporation | Integral fiber optic printhead |
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